Failed to load class when working with cloudera hadoop java training project

Question

I'm using cloudera quickstart to implement an hadoop project in java: my cloudera-quickstart version is 5.8.0 here are the error messages:

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
17/04/09 14:11:36 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
17/04/09 14:11:36 INFO Configuration.deprecation: session.id is deprecated. Instead, use dfs.metrics.session-id
17/04/09 14:11:36 INFO jvm.JvmMetrics: Initializing JVM Metrics with processName=JobTracker, sessionId=
Exception in thread "main" java.lang.NoClassDefFoundError: org/codehaus/jackson/map/JsonMappingException
    at org.apache.hadoop.mapreduce.Job.getJobSubmitter(Job.java:1291)
    at org.apache.hadoop.mapreduce.Job.submit(Job.java:1302)
    at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1325)
    at StubDriver.main(StubDriver.java:41)
Caused by: java.lang.ClassNotFoundException: org.codehaus.jackson.map.JsonMappingException
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    ... 4 more

I checked my Referenced Libraries at this simple training project, in the buildpath libraries, slf4j-api-1.6.1.jar; slf4j-api1.7.5.jar; slf4j-api.jar are all included.

score 1 · Answer 1 · answered Apr 10 '17 at 20:32

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".

Along with the slf4j-api jar, slf4j-log4j12 jar also should be added.

Caused by: java.lang.ClassNotFoundException: org.codehaus.jackson.map.JsonMappingException

Your project is missing jackson-mapper-asl jar.

These jars are already available as part of Hadoop libraries. Updating your project's CLASSPATH to include hadoop classpath would be the easiest fix.

Failed to load class when working with cloudera hadoop java training project

1 Answers1